23393+7738 NHR 9 AB (Errai)

Coord 2000	23393+7738		Discov num	NHR   9		Comp	AB		Coord arcsec 2000	23 39 20.98 +77 37 55.1
Date first	2006		Date last	2020		Obs	8
Pa first	257		Pa last	214.6		P.A. Now (θ)	214.6°
Sep first	0.9		Sep last	1.787		Sep. Now (ρ)	1.787"
Mag pri	1.04		Mag sec	7.30		delta mag (ΔM)	6.26		Spectral class	K1III (yellow-orange)
Pri motion ra	-049		Sec motion ra
Pri motion dec	+127		Sec motion dec
Notes	N O K (See Notes, Orbital solution, K-band or other infrared magnitudes)

Visually invisible, K-band or other infrared star : Summary line gives K-band or other infrared (>1 micron) magnitudes This double is physical.

Common name	Errai		Other name	gam CepAa,Ab		Var name	NSV14656 Cep		Constellation	Cepheus
SAO	10818		HIP	116727		Tycho2	4606-03584-1		Gaia DR2	2281778105591104768
HD	222404		HR	8974		GC	32875		BD	BD+76 928
Bayer	Gamma Cephei		Bayer name	Gam Cep		Flamsteed	35 Cephei		Flamsteed name	35 Cep
FK5	893		Distance	14.1		Distance ly	45.99		Bayer greek	γ Cep

Period (P)	902.9d (2.47y)	± 3.5	Periastron (T)	53147d (2004.387y)	± 71	Semi-major axis (a)	332.4m	± 7.7
Eccentricity (e)	0.115	± 0.058	Inclination (i)	°		Longitude of periastron (ω)	63°	± 27
Node (Ω)	°		Notes			Reference	Nhr2007
Equinox			Last observation	2006		Grade	7	(1=Definitive, 9=Indet.)

label theta rho 2000-01-01 157.3 0.331 2001-01-01 281.1 0.361 2002-01-01 78.7 0.295 2003-01-01 225.4 0.368 2004-01-01 354.8 0.315 2005-01-01 165.4 0.336 2006-01-01 288.0 0.357 2007-01-01 88.9 0.297 2008-01-01 231.9 0.370 2009-01-01 4.0 0.310 2010-01-01 173.1 0.342 2011-01-01 295.1 0.353 2012-01-01 98.9 0.300 2013-01-01 238.4 0.370 2014-01-01 13.4 0.305 2015-01-01 180.7 0.347 2016-01-01 302.3 0.348 2017-01-01 108.7 0.304 2018-01-01 244.9 0.371 2019-01-01 23.1 0.301 2020-01-01 188.0 0.351 2021-01-01 309.8 0.344 2022-01-01 118.2 0.308 2023-01-01 251.5 0.370 2024-01-01 33.1 0.298 2025-01-01 195.2 0.355 2026-01-01 317.5 0.338 2027-01-01 127.5 0.313 2028-01-01 258.0 0.369 2029-01-01 43.2 0.296 2030-01-01 202.2 0.359 2031-01-01 325.4 0.333 2032-01-01 136.5 0.318 2033-01-01 264.6 0.367 2034-01-01 53.5 0.295 2035-01-01 209.0 0.363 2036-01-01 333.6 0.328 2037-01-01 145.2 0.323 2038-01-01 271.2 0.365 2039-01-01 63.8 0.294 2040-01-01 215.8 0.365 2041-01-01 342.1 0.322 2042-01-01 153.7 0.328 2043-01-01 278.0 0.362 2044-01-01 74.1 0.295 2045-01-01 222.4 0.368 2046-01-01 350.8 0.317 2047-01-01 161.8 0.334 2048-01-01 284.9 0.359 2049-01-01 84.3 0.296 2050-01-01 229.0 0.369

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

Period (P)	67.5y	± 1.4	Periastron (T)	1991.605y	± 0.031	Semi-major axis (a)	1.467a	± 0.046
Eccentricity (e)	0.4112	± 0.0063	Inclination (i)	119.3°	± 1	Longitude of periastron (ω)	161.01°	± 0.4
Node (Ω)	18.04°	± 0.98	Notes	n		Reference	Nhr2007
Equinox			Last observation	2006		Grade	5	(1=Definitive, 9=Indet.)

label theta rho 2000 142.1 0.687 2001 130.9 0.669 2002 119.4 0.669 2003 108.2 0.688 2004 97.9 0.725 2005 88.8 0.776 2006 80.9 0.838 2007 74.2 0.908 2008 68.4 0.983 2009 63.5 1.060 2010 59.3 1.139 2011 55.6 1.217 2012 52.3 1.294 2013 49.5 1.369 2014 46.9 1.441 2015 44.5 1.510 2016 42.4 1.576 2017 40.4 1.638 2018 38.5 1.696 2019 36.8 1.750 2020 35.2 1.799 2021 33.6 1.844 2022 32.2 1.885 2023 30.8 1.921 2024 29.4 1.951 2025 28.1 1.977 2026 26.8 1.998 2027 25.5 2.014 2028 24.2 2.024 2029 23.0 2.029 2030 21.7 2.028 2031 20.5 2.022 2032 19.2 2.011 2033 18.0 1.993 2034 16.7 1.970 2035 15.3 1.941 2036 13.9 1.905 2037 12.5 1.864 2038 11.0 1.816 2039 9.4 1.761 2040 7.7 1.701 2041 5.8 1.633 2042 3.8 1.559 2043 1.6 1.479 2044 359.1 1.392 2045 356.3 1.299 2046 353.0 1.200 2047 349.1 1.096 2048 344.4 0.989 2049 338.5 0.879 2050 331.0 0.772

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st. Measures: green=micrometric, blue=interferometric, purple=photographic